Tips for antagonists?

Regarding my last post, I thought about it and it wasn't that the plot in general isn't working; it's that my antagonist was wrong for the story. He clashes with the themes of the protagonist gang and they don't really have a strong connection to him, so what I have now is half of two decent ideas crammed badly together. (Specifically, a group whose themes relate to home and birth family versus found family against a villain who seeks immortality doesn't mesh well; he needs a hero whose themes relate more to death and infirmity.) It took me long enough to come up with this motivation for him, and I have no clue what to have him be doing now. That turned out to be the problem I was having when I said I'm "not good with plots"; what I'm actually bad at is antagonistic forces. I need a way to get around that. Mother suggested I crib from real incidents (a la Silence of the Lambs with Bundy) but that doesn't work well for a fantasy novel. How do I solve that problem?

Any tips/help for making a character seem more arrogant or almost narcissistic without looking like a bad person? I know this is a weird one, but I'm having a lot of trouble. As an example, here is a snippet of writing with the pov of the character: ⭕⭕⭕ “All right,…

So, I’m writing a bar fight between my MC (named Ryan) and six other guys. But before you say he is ridiculously outnumbered and it will be an unrealistic scene, he has help from someone (Sam), and Ryan has had very intensive training in the deadliest of martial arts. What’s…

While not horrible, my writing is often verbose, pedantic, and unclear. I also take an abnormally long time to write almost anything. I regularly spend minutes deleting and rewriting a sentence, only to give up and settle for mediocre wording. I often have ideas that I end up omitting because…